Joint for corrugated boxes



Oct. 8, 1929.A M, c. Rom-:R

JOINT Fon connUGATED oxs Filed Jan. 7, 1927 INVENTOR Patented Oct. 8, 1929 UNITEDy STATES MORRIS C. ROMER, OF BROOKLYN, NEW YORK JOINT FOR CORRUGATED BOXES Application filed January 7, 1927. Serial No. 169,662.

This invention relates to a joint for multiple-ply materials yand has particular reference to a joint for corrugated boxes, the same being in the nature of an improvement upon my prior United States Letters Patent No.

1,617 ,2741, granted February 8, 1927.

The present invention comprehends a locking joint for multiple-ply material which joint is especially designed as a corner connection for a box body of` the foldable or collapsible type to be employed in lieu of connecting the meeting edges at the corner with a strip of tape as is now the present practice.

lThe invention furthermore comprehends a lock joint of the character specified which establishes a strong, durable, and flexible connection especially designed for the corner of the box body.

Other objects reside in the simplicity of the construction of the joint, the economy with which the same may be produced, and the general efficiency derived therefrom.

lVith the above recited and other objects in View, reference is had to the following specification and accompanying drawings in which there is exhibited certain examples or embodiments of the :invention which are in no way intended as limitations upon the scope of the appended claims as it is to be clearly understood that variations and modifications which properly fall within the scope oi said claims may be resorted to when found expedient.

In the drawings- Figure 1 is a collective sectional perspective view illustrating the sections of the material in separated relation prior to their interengagement; o

Fig. 2 is a horizontal sectional view through the box body partially collapsed and illustrating the improved joint provided at one of' the corners;

Fig. 3 is a fragmentary similar sectional view illustrating the lock joint of the box body when setup;

Fig. l is a fragmentary sectional View of a slightly modified adaptation of the invention;

Fig. 5 is a fragmentary sectional view illustrating a further modified form of the invention when the box is in partially collapsed condition;

Fig. 6 is a similar view thereof when the box is in set-up condition.

Referring to the drawings bycharacters of reference, 10 and 11 designate, respectively, two sections of material, the meeting edges of which are adapted to be joined by a lock joint made in accordance with the invention. The material must of' necessity be ci multiple-ply and is particularly designed for at least three plies of material, including outer, inner and intermediate plies, 12, 13 and 14C of the section 10, and outer, inner and intermediate plies 15, 16 and 17 of the section 11, the intermediate plies 14 and 17 being the usual corrugated iiller. In utilizing material of this nature as manufactured, rthe filler or intermediate ply 14; of the section 10 and the inner ply 18 thereof, are routed away f or terminated an appropriate distance from the end of the outer ply 12, while the intermediate ply 17 of the section 11 is routed away or terminated short of the ends of the outer and inner kplies 15 and 16. Also in the section 11, the inner ply is cut oli or terminated short of the outer ply 15 to provide a projecting portion 18. The outer ply 15 of the sect-ion 11 is provided with parallel scores 19 and 20, the former being in substantial alinement with the terminal or extremity of the intermediate ply or filler 17 and the latter in substantial alinement with the terminal or free edge of the portion 1S. Between the score lines 19 and 20, an outwardly bend able section. 21 is defined and between the score lines 2O and the free edge of the outer ply 15, an inwardly bendable terminal 22 is provided. The projecting portion of the outer ply 12 of the section i0, which extends beyond the remaining plies, is provided with parallel score lines 23 and 24 defining an outwardly bcndable portion 25 therebetween and an outwardly bendable portion 26 between the score lines and the free outer edge of said ily. n

l Inpractice, the terminal 22 of the section 11 is engagedy between the portion 25 and the terminal V26 of the section 10, while the terminal 26 of the section 10 is embraced or interloclred between the portion 21 and the terminal 22 of the outer ply 15 of the section 11. It will further be observed in Figs. 2 and 3, that the portion 25 is also covered on the inner side tace by the projecting portion 18 of the inner ply 16 of the sect-ion 11. It thus follows that in addition to establishing strong, durable connection between the sections providing substanially flush joint, only one ply oi material serves connecting web between the sections, which admirably adapts the joint tor a flexible corner connection employed in a collapsible box body. It is, however, to be understood that while the joint is primarily adapted es a corner joint, this is in no way int-ended as a limitation upon the use to which it may be pnt. lt should be further noted that either' an adhesive, stitching, or any other si ltable means may be employed 1Cor re4 the interloclred portions in their prope 1 relation. Then a box body equipped with a corner c ot this description is set up or opened so the sections 10 and 11 forming the side walls are disposed at a right angleVj the joint assumes the position illustrated in 3, with the tree edge ot the extendino portion 10 abnt- Y ting against the inner side races of the inner ply 13 adjacent its ree edge.

In the modified adaptation oi the invention illustrated in Fig. 4, the joint is substantially identical with that heretofore described w l the exception that the terminal 26 of the onter ply 12 ot the section 10 is provided wit1 n an extremity 27, the edge oi which extremity is alined with the free edge of the terminal 22 of the outer ply 15 or" the section 11 in establishing` the joint, after which the terminals and portions are rolled over to the position illustrated in 4, in which position the extremity 27 is disposed between vthe terminal 26 and the terminal 22.

In the modified form oi the invention illustrated in Figs. 5 and 6., the sections 30 end 31 are identically formed or a l in reversed relation, the section 30 having an outer ply 32 extendineconsiderably7 beyond the intermediate ply 33 and a distance beyond the inner ply 34, the extending portion oi. the onter ply 32 having terminal 35 and reyersely bent extremity 36. rlhe section 31 is provided with an inner ply 37 extending considerably beyond theinterinediate ply 38 and i distance beyond the outer ply 39. The ext 'ng portion oit the inner ply 37 of the section 31 is provided with a bendable extremity 40 and a. reversely bent terminal 41. The inner ply 34 of the section 30 is formed with reversely bent terminal 42 which is interengag'eable with the terminal 41 on the inner ply 37 of the section 31. The outer ply 39 ot the section 31 is provided with a reversely bent terminal 43 which is interengaoeable with the terminal 36 of the outer ply 32 of the section 30.

In addition to affording an eEective lock especially designed :tor the corner of a box body, it will be noted that the joint thus termed is of two-ply thickness which equals practically the tensile strength or' the material from which the box is constructed.

lllhat is claimed is:

1. loch joint for connecting the meeting edges of sections of multiple ply material, comprising a. portion oit the outer ply oi each section extending` beyond the inner pli said portions being scored., bent and interengaged to establish a connection presenting a single ply ot material 1Cor rendering the connection flexible to permit ot relative folding of the sections.

2. A locli oint for connecting the meeting edges oi sections or" material haring' outer, inner intermedi4 A rising portions o1 the oute" ot each section extending beyond the n i' and intermediate plies, said portions being scored, bent and ereng'aged to provide a locking' connection, and a portion or" the inner ply ot one section extenli o' beyond the irter'ccfliatc plies to provH internal cover a for the lochconnection.

3. A loclr joint for connecting` the meet-ing edges of sections of nir tiple-ply corrugated material, compris' o; a por"on oi" the outermost ply ot erich sec" t ion extending beyond the Yinner and intermediate plies, the said extended portions being` scored, bent and embracingly engaged with each other to establish Ya connection presenting' sii gie ply of material for renderinf;r the connection ilexible to perinit otrelative toldinp; of the sections. A

4. A lock joint for connecting' the meeting' edges et sections et multiple-ply corrugated material. comprising' a portion ot the (interinost ply of each section extending' `beyond. the inner and intermediate plies. the said extended portions be' 0 scored b j ind embracingly interenpj'agged with each other to establish connection present-in:gr a single ply oi inaterial for rendering' the connection flexible to permit of relativo folding ot the sections.

5. 1 flexible corner lock joint for multipleply corrugated collapsible bof; bodies? coinprising portion ot the outermost ply et the meeting ed 1.1 riding' beyond the inner and interrne iate plies, the said portions beinnscored. bent and einbracirigrl'T interenpgag'ed to establish connection pi .senting a single p ,i et material tor rendering' the connecti flexible to permit oi' relative tolding oi the sections.

MORRIS C. 

